Scissors



March 1, 1932. w. A. ZEIDLER 1,847,801

SCISSORS Filed Aug. 18, 1926 I i I!" 2 mmnmn mmm 7 fly" INVENTOR M'Ib'amA.Ze1'd1ez;

Ai'TORNEY winnmm a mama, am

. 2 Figure 4 is aview of Patented Mar. I 1, 1932 UNrrEosTATEs YOBK, n. y nssrqnoafntuasnn 'Assxeimms. 'ro rman a; m ron 1 scrssoa s a licators August is, 1926. sei lal'liofmakfl.

I This inventio'nis directed to scissors and particularly to atype having removable cutting blades, that is, cutting elements which may be applied to, or removed from the main elements of-the. scissors and forming the cutting edges forthe scissors.

.The lnventlon herein expressed 1s analogous to that defined in my co-pending application, SerialNo. 60,7 filed October 6, 1925 issued as Patent No. 1,609,688, and dated December7,1926. I I

The invention inthe presentiapplication, however, while effecting the desirable results fdefined in my co-pending application, has

certain 'features. of --advantage' not found therein.

The main object of the present inventionis to provide av scissors having removable cutting blades, thevarious parts being so-correlated that thereis always perfect articulation between the cutting edges.

- A further object is to so form andmount' 'thecutting blades that they will be tensioned 0r stressed during the cutting operation in varying degrees, dependent upon thestress induced in the cutting operation;

These, andother objects morefully lde- .fined inthe specification are enumerated in the claims. 4

' w Referring to the drawings: I Figure 1 is a planview ofa pair .ofscissors embodying the features ofthe invention.

Figure2 is a fragmentary portion. of one of the scissors element's showing {the exterior side.

a .Figure 3 is a similar view'of, theelement showing the interior side.

oneof the removable cutting blades.

Figure 5 1s a .Viewlooking directly the point of the blade.

' .1ineI9-9 of Figure 1.

Figure T0 is a fragmentary view illustrating the method 'of removing blades.

o Figure llis a .plan'view of. the wrench .employed for adjusting. the scissors and removing the cutting blades.

In my co-pending application referred to, the blade was shown as having an impressed bendxtherein which gave it anormal offset from thehold-ing element and served to snug and stress it upon'said holding element when itwas: applied and anchored'by the pintle.

Stressing was effected bya transverse angular-engagement ofthe blade with the scissorselement in order to provide always, perfeet-and: true articulation of the cutting edges whilethey were functioning as cutters.

,1; This particular feature in such a scissors "is of paramount import ance and it is maintained in the invention herein described in conjunction with additional features to pro- ;vide a very eificient'scissors-ofthe removable bladetype.-.

In place ofutilizingaflat blade normally sprung, away from its holding element and with a pocket at its end, the present invention contemplates forminga. complete blade element hollow and providing a complete encasement of the element giving additional strength to the cutting blade. and possibilities forsfine grinding'not heretofore possible.

L .In the accompanying.drawings,numeral 1, denotesone of the scissors elements, and 2, thecooperating element. Both are provided with. finger openings 3, 4,-and the element 2,

may have, as illustrated, a finger supporting hook5..

Both elements .5 have a. pintle opening through which they are pivoted on a suitable intle and each element, at its interior side,

has arecess 6, forthe reception of the end 7,, of the cutting blade. Sunk belowthe bottomof. the recess 6, is a depression 8, which extends beyond the wall of the recess 6, and a suflicient distance toward the pintle opening sothat the end 7, of the blade will partially overlie thedepression 8.

This depression 8, in conjunction with a suitable tool such as the wrench illustrated in Figure 11, forms a convenient means for ejecting the cuttingblade from the element,

serted in the depression 8, and turned against,

the rounded end of the blade to force it forward and outward fron the recess 6.

This recess 6,

supportc-fonthe .cutting blade and in conjunction with the extended. portion 10, .ofthe element, gives a perfect support for the blade. These elements 10,.as best-illustrated inlFigure 9, are tapered from the back toward the meeting edges of the scissors and there is a distinct holding rib 11, extending along the upperand outer edge. This rib 11, extends from the hub 12, to the outer end 13, and obviously lies in-an angular positionwith reference to the inner ed-gelt. e

l This, in conjunction with the :closely formed and fitted blade, p'rovidesza-means for tensioning the blade lengthwise during its cutting operation, much the same as the angular engagementrof element and cutting blade in my :co-pending application referred @In the present case, however, the action is .even more delicate and the entire removable blade is backed up during its cutting operation by this engagement. 7 e

it will benoted both inFigs. '6, and 9, that the blade has a main'ibase portion 15, with the projecting :tang 7, and at-one side a cutting edge 16a. The base portion continues into a rounded back 17, whichisagain folded over into ,a concave outer fold 18, the latter extending to the cuttingedge 16. Th-epoint of the shear blade is indicated at 21, audit will be noted that there is a'cu rvature betweenthe points and Y, as indicated in Figures-6 and 7. 1

a Ofcourse, the edge 16, and the edge 16a,

and the folded over portion of the blade, are

ground to givev clearance from the actual cutting edge and-the'blade portion 15.

This removable blade is, of" course, made ofa thin sheet stock capable of high temper- -ing. As will be noted, it has'formed therehe'ld'to perfect alignmentby the rib 11-, which occupies the position of an acute angle with a cutting edge.

With the blade anchored in the hub of the scissors any force applied to the cutting edge during a cutting operation tends to force the blade against the rib 11, and there is, therefore, a tendency for stressing the blade with reference to the anchorage.

The result of this stressing tendency is to cause the edge of the blade to snug closely into perfect articulation with the cooperating .cutting blade. This gives a perfect cutting action without crushing, as of course, the

v 1 blades arebrought to What might be termed V s for the end of the blade is .comparatively long to aid in giving 'a lateral a razor edge. A further feature of con struction is the :blade its elflwhi'cli aids in its perfect articulation. As the elements 10, are moved toward each other in a cutting ac- .tion,.t'he main surfaces 15, of the blades,due

to the anchorage of the blades, at the pivot,

ribs of the element and thus cause the blades against the ribs .of the elements, which -ribs.

are at an acute angle to the cutting edges of athetblades, there is a pronounced tendencyIfor the blades :to always pull toward each other at the cutting edges into perfect articulation from end to end of the blades. other hand, the ribs 11, andchannels '20,

should lie parallel to the edges. of the blades,

the pressure and cutting action would tend to separate the blades instead of inducing the pressure, which would cause the edges to against each other, imperfect articulation, as is thecase in the present invention.v

' l/Vhen the bladesare formed, there is a very slight but perceptible twist orlofiset thrown into the blade which is'maintained to thnowalways, the cutting edges into'true, following'articulation. 1 v

This is again enhanced by the "grinding which gives a: perfect straight edge grind to the cutting edge with a variance of an.

few thousandthsbetween the point and the point Y, as indicatedin Figure 7.. i "The concavity of the blade is maintained from end to end.

In this structure of blade a thingauge metal may be employed and when it is formed into the perfect envelope described, there is double thickness of metal for edge grinding. The closure at the edges is so perfect that the ground edge to all purposes and intents is as though it were a homogeneous structure.

- With the understanding that the'end 7.

is firmly anchored in the element and the-co operatingrib 11, of the element and depression 19, of the blade hug tightly-fromend If, on the:

to end, it Would be apparent that during any cutting operation there is a tendency to stress the metal of the blades longitudinally. This throws the strain upon the blades which causes their edges to'come into closer articulation, dependent upon the stress imposed thereon. I

It is this construction and action, so far as applicant is able to perceive, that gives a perfect articulation and permits the format-ion of what is practically a razor edge for thecutting elements.

I have not specifically described the pintle employed and illustrated in Figure 8, as this forms the subject of a copending application.

lVhat I claim as my invention and desire to secure by Letters Patent is:

1. Scissors having elements for supporting removable scissors blades and with each element having a hub portion recessed to receive and support one end of the removable blade, and a depression extending under and beyond the blade, providing means for the insertion of a tool for ejecting the blade.

2. Scissors having elements for supporting removable scissors blades and each element at an angle to the cutting edge of its blade and a corresponding formation in each en-' veloping blade to fit said rib.

7. 'A removable scissors blade comprising a formed up sheet metal element folded upon itself with its two edges brought closely together and ground away to a cutting edge, said blade tapering from heel to point and a flat extension extending from the enveloping portion, providing means for attachment to a scissors element.

8. A removable scissors blade comprising a formed up sheet metal element folded upon itself with its two edges brought closely together and ground away to a cutting edge, said blade tapering from heel'to point and having interiorly thereof, at the side opposite the cutting edge, a channel and a fiat extension extending from the enveloping portion,

providing means for attachment to a scissors,

element.

WILLIAM A. ZEIDLER.

having means for supporting one end of the I removable scissors blades, each elementhaving a perforation for apintle, means at opposite sides of the pintle and extending longitudinally of the element for preventing lateral movement of its blade, when the same is engaged therewith, and a depressionextending under and beyond the end of the blade providing means for the insertion of a tool for ejecting said blade.

5. Scissors having elements for supporting removable blades, each of said elements provided with a raised ribelocated at an angle to the cutting edge of the scissors, a removable blade completely enveloping each scissors element and each blade having an interior longitudinal channel conforming to the rib of the element, each of said blades ground across its meeting edges to provide a cutting edge.

6. Scissors having elements for supporting removable blades, a removable blade fitting over and enveloping each of said elements and each having the meeting edges of the enveloping blade ground to a cutting edge, a raised portion extending along each element 

